Browsing by Author "Bathala, K."

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Current Source Isolated Bidirectional Series Resonant DC-DC Converter for Solar Power/Fuel Cell and Energy Storage Application
(IEEE Computer Society, 2021) Bathala, K.; Kishan, D.; Nagendrappa, N.
This paper presents the performance analysis of a current source isolated bidirectional DC-DC converter (CSIBDC) for PV and Fuel Cell (FC) applications. The proposed CSIBDC converter has been chosen to integrate solar power with energy storage systems. Since the solar power is intermittent in nature and it has no dispatch ability on its own, the proposed converter can enable small voltages available from PV to step up by operating in the boost conversion mode. The current source dual active bridge (DAB) converter topology is a good choice for battery charging and discharging applications due to its bidirectional power transfer capability. To achieve high power density with ZVS transition, the proposed dual active bridge converter is operated with phase shift control technique. In order to evaluate the performance of the proposed DAB converter the simulations are carried out using PSIM software. Â© 2021 IEEE.
High frequency isolated bidirectional dual active bridge DC-DC converters and its application to distributed energy systems: an overview
(Institute of Advanced Engineering and Science, 2023) Bathala, K.; Kishan, D.; Nagendrappa, N.
Among the DC-DC converters, an isolated bidirectional dual active bridge converter is a core circuit for high-frequency power converters in distributed energy system applications. These high-frequency power conversion systems attract academia and industry due to various advantages, such as high-power density, less weight, reduced noise, high efficiency, low cost and high reliability. First, the importance of power electronic converters in modern-day life is introduced. Second, a topological overview of voltage-fed and current-fed isolated bidirectional dual active bridge converters is presented with their importance in integrating hybrid power sources. Third, switching modes of isolated bidirectional DC-DC converters are also presented with a degree of freedom of control. Forth, performance evaluation of voltage-fed and current-fed isolated bidirectional converters has been presented with an example. Their suitability in integrating fuel cells and photovoltaics with energy storage systems in low to medium-power applications is presented. © 2023, Institute of Advanced Engineering and Science. All rights reserved.
Soft Switched Current Fed Dual Active Bridge Isolated Bidirectional Series Resonant DC-DC Converter for Energy Storage Applications
(MDPI, 2023) Bathala, K.; Kishan, D.; Nagendrappa, H.
This paper proposes a high-frequency isolated current-fed dual active bridge bidirectional DC–DC series resonant converter with an inductive filter for energy storage applications, and a steady-state analysis of the converter is carried out. The performance of the proposed converter has been compared with a voltage-fed converter with a capacitive output filter. The proposed converter topology is operated in continuous conduction mode with zero circulation current (ZCC), less current stress and high efficiency. The conditions required for soft switching are determined, and it is found that the converter operates with soft switching of all switches for a wide variation in load and input voltage without loss of duty cycle. Current-fed converters are suitable for low-voltage renewable energy applications because of their inherent boosting capability. An inductive output filter is chosen to make the output current ideal for fast charging and high-power-density battery storage applications. Simple single-phase shift control is used to control the switches. The performance of the converter is studied using PSIM simulation software. These results are confirmed by an experiment on a 135 W converter on an OPAL-RT real-time simulator. The maximum efficiency obtained in simulation is 96.31%. Simulation and theoretical results are given in the comparison table for both forward and reverse modes of operation. A breakdown of the losses of this converter is also presented. © 2022 by the authors.